Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Contract Liabilities) (Details)

v3.20.4
Revenue Recognition (Contract Liabilities) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Contract liabilities   $ 229 $ 283
Deferred initial franchise fee revenue      
Disaggregation of Revenue [Line Items]      
Contract liabilities   136 136
Deferred loyalty program revenue      
Disaggregation of Revenue [Line Items]      
Contract liabilities   75 86
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress $ 16    
Co-branded credit cards program      
Disaggregation of Revenue [Line Items]      
Contract liabilities   0 34
Deferred hotel management fee revenue      
Disaggregation of Revenue [Line Items]      
Contract liabilities   1 0
Product and Service, Other [Member]      
Disaggregation of Revenue [Line Items]      
Contract liabilities   $ 17 $ 27
Maximum      
Disaggregation of Revenue [Line Items]      
Standard Management Agreement, Term   20 years  
Minimum      
Disaggregation of Revenue [Line Items]      
Standard Management Agreement, Term   10 years